3 x AAA Battery Holder with On/Off Switch, JST, and Belt Clip : ID 3286 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: Duracell Coppertop AAA Batteries, 28 Count Pack Triple A Battery with Long-Lasting Power for Household and Office Devices (Ecommerce Packaging) : Health & Household
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Alkaline AAA batteries - 3 pack : ID 3520 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Duracell Coppertop AAA Batteries with Power Boost Ingredients, 8 Count Pack Triple A Battery with Long-lasting Power, Alkaline AAA Battery for Household and Office Devices : Health & Household